<template>
  <div class="login-container">
    <el-row>
      <el-col :lg="14" :md="11" :sm="24" :xl="14" :xs="24">
        <div style="color: transparent">占位符</div>
      </el-col>
      <el-col :lg="9" :md="12" :sm="24" :xl="9" :xs="24">
        <el-form
          ref="form"
          class="login-form"
          label-position="left"
          :model="form"
          :rules="rules"
        >
          <div class="title">hello !</div>
          <div class="title-tips">
            {{ translateTitle('欢迎来到') }}{{ title }}！
          </div>
          <el-form-item prop="user_name" style="margin-top: 40px">
            <el-input
              v-model.trim="form.user_name"
              :placeholder="translateTitle('请输入用户名')"
              tabindex="1"
              type="text"
            >
              <template #prefix>
                <vab-icon icon="user-line" />
              </template>
            </el-input>
          </el-form-item>
          <el-form-item prop="user_password">
            <el-input
              :key="passwordType"
              ref="user_password"
              v-model.trim="form.user_password"
              :placeholder="translateTitle('请输入密码')"
              tabindex="2"
              :type="passwordType"
            >
              <template #prefix>
                <vab-icon icon="lock-line" />
              </template>
              <template v-if="passwordType === 'password'" #suffix>
                <vab-icon
                  class="show-password"
                  icon="eye-off-line"
                  @click="handlePassword"
                />
              </template>
              <template v-else #suffix>
                <vab-icon
                  class="show-password"
                  icon="eye-line"
                  @click="handlePassword"
                />
              </template>
            </el-input>
          </el-form-item>
          <el-form-item prop="captcha">
            <div class="captcha">
              <el-input
                v-model.trim="form.captcha"
                placeholder="验证码"
                tabindex="3"
                type="text"
                @keyup.enter.native="handleLogin"
              >
                <template #prefix>
                  <vab-icon icon="shield-keyhole-line" />
                </template>
              </el-input>
              <div class="captchaImg" @click="getCaptcha">
                <img :src="captcha" />
              </div>
            </div>
          </el-form-item>
          <el-button
            class="login-btn"
            :loading="loading"
            type="primary"
            @click="handleLogin"
          >
            {{ translateTitle('登 录') }}
          </el-button>
          <div class="loginbot">
            <router-link to="/register">
              {{ translateTitle('注册') }}
            </router-link>
            <router-link to="/findpwd">忘记密码？</router-link>
          </div>
        </el-form>
      </el-col>
      <el-col :lg="1" :md="1" :sm="24" :xl="1" :xs="24">
        <div style="color: transparent">占位符</div>
      </el-col>
    </el-row>
  </div>
</template>

<script>
import { mapActions, mapGetters } from 'vuex'
import { translateTitle } from '@/utils/i18n'
import { login, captcha } from '@/api/user'
import { isOne, isBig, isPassword } from '@/utils/validate'

export default {
  name: 'Login',
  data() {
    const validateUsername = (rule, value, callback) => {
      if ('' === value)
        callback(new Error(this.translateTitle('用户名不能为空')))
      else if (!isOne(value))
        callback(new Error(this.translateTitle('用户名不能少于1位')))
      else if (!isBig(value))
        callback(new Error(this.translateTitle('用户名不能多于50位')))
      else callback()
    }
    const validatePassword = (rule, value, callback) => {
      if (!isPassword(value))
        callback(new Error(this.translateTitle('密码不能少于6位')))
      else if (!isBig(value))
        callback(new Error(this.translateTitle('密码不能多于50位')))
      else callback()
    }
    return {
      form: {
        user_name: '',
        user_password: '',
        captcha: '',
        captcha_id: '',
      },
      rules: {
        user_name: [
          {
            required: true,
            trigger: 'blur',
            validator: validateUsername,
          },
        ],
        user_password: [
          {
            required: true,
            trigger: 'blur',
            validator: validatePassword,
          },
        ],
        captcha: [
          {
            required: true,
            trigger: 'blur',
            message: '请输入验证码',
          },
        ],
      },
      loading: false,
      passwordType: 'password',
      redirect: undefined,
      timer: 0,
      captcha: '',
    }
  },
  computed: {
    ...mapGetters({
      title: 'settings/title',
      token: 'user/token',
    }),
  },
  watch: {
    $route: {
      handler(route) {
        this.redirect = (route.query && route.query.redirect) || '/'
      },
      immediate: true,
    },
  },
  mounted() {
    this.getCaptcha()
  },
  beforeRouteLeave(to, from, next) {
    clearInterval(this.timer)
    next()
  },
  methods: {
    translateTitle,
    ...mapActions({
      setToken: 'user/setToken',
    }),
    handlePassword() {
      this.passwordType === 'password'
        ? (this.passwordType = '')
        : (this.passwordType = 'password')
      this.$nextTick(() => {
        this.$refs.password.focus()
      })
    },
    handleRoute() {
      return this.redirect === '/404' || this.redirect === '/403'
        ? '/'
        : this.redirect
    },
    async getCaptcha() {
      const { data } = await captcha()
      this.captcha = data.captcha_img
      this.form.captcha_id = data.captcha_id
    },
    handleLogin() {
      var that = this
      this.$refs.form.validate(async (valid) => {
        this.loading = true
        if (valid) {
          var timer = setTimeout(() => {
            this.loading = false
            this.$message({
              message: '登录超时！',
              type: 'error',
            })
          }, 10000)
          const { data, ret } = await login(this.form)
          if (ret == 200) {
            this.loading = false
            clearTimeout(timer)
            that.setToken(data.access_token)
            this.$message({
              message: '登录成功！',
              type: 'success',
            })
            this.$router.push('/index')
          } else {
            this.getCaptcha()
          }
          this.loading = false
          clearTimeout(timer)
        }
        this.loading = false
        clearTimeout(timer)
      })
    },
  },
}
</script>

<style lang="scss" scoped>
.login-container {
  height: 100vh;
  background: url('~@/assets/login_images/background.jpg') center center fixed
    no-repeat;
  background-size: cover;
}

.login-form {
  position: relative;
  max-width: 100%;
  padding: 4.5vh;
  margin: calc((100vh - 475px) / 2) 5vw 5vw;
  overflow: hidden;
  background: url('~@/assets/login_images/login_form.png');
  background-size: 100% 100%;

  .title {
    font-size: 54px;
    font-weight: 500;
    color: $base-color-white;
  }

  .title-tips {
    margin-top: 29px;
    font-size: 26px;
    font-weight: 400;
    color: $base-color-white;
  }
  .captcha {
    display: flex;
    justify-content: space-between;
    .el-input {
      width: calc(100% - 130px);
    }
    .captchaImg {
      cursor: pointer;
      width: 120px;
      height: 48px;
      display: flex;
      align-items: center;
      justify-content: flex-end;
      overflow: hidden;
      border-radius: 4px;
      img {
        width: 120px;
        height: 48px;
        object-fit: cover;
      }
    }
  }
  .login-btn {
    display: inherit;
    width: 100%;
    height: 50px;
    margin-top: 5px;
    border: 0;
    font-size: 18px;
    &:hover {
      opacity: 0.9;
    }

    .forget-passwordword {
      width: 100%;
      margin-top: 40px;
      text-align: left;

      .forget-password {
        width: 129px;
        height: 19px;
        font-size: 20px;
        font-weight: 400;
        color: rgba(92, 102, 240, 1);
      }
    }
  }
  .loginbot {
    margin-top: 20px;
    display: flex;
    justify-content: space-between;
  }
  .tips {
    margin-bottom: 10px;
    font-size: $base-font-size-default;
    color: $base-color-white;

    span {
      &:first-of-type {
        margin-right: 16px;
      }
    }
  }

  .title-container {
    position: relative;

    .title {
      margin: 0 auto 40px auto;
      font-size: 34px;
      font-weight: bold;
      color: $base-color-blue;
      text-align: center;
    }
  }

  i {
    position: absolute;
    top: 8px;
    left: 5px;
    z-index: $base-z-index;
    font-size: 16px;
    color: #d7dee3;
    cursor: pointer;
    user-select: none;
  }

  .show-password {
    position: absolute;
    right: 25px;
    left: -35px;
    font-size: 16px;
    color: #d7dee3;
    cursor: pointer;
    user-select: none;
  }

  :deep() {
    .el-form-item {
      padding-right: 0;
      margin: 20px 0;
      color: #454545;
      background: transparent;
      border: 1px solid transparent;
      border-radius: 2px;

      &__content {
        min-height: $base-input-height;
        line-height: $base-input-height;
      }

      &__error {
        position: absolute;
        top: 100%;
        left: 18px;
        font-size: $base-font-size-small;
        line-height: 18px;
        color: $base-color-red;
      }
    }

    .el-input {
      box-sizing: border-box;

      input {
        height: 48px;
        padding-left: 35px;
        font-size: $base-font-size-default;
        line-height: 58px;
        background: #f6f4fc;
        border: 0;
      }
    }

    .code {
      position: absolute;
      top: 4px;
      right: 4px;
      cursor: pointer;
      border-radius: $base-border-radius;
    }
  }
}
</style>
